If are doomed anyway, there's no point worrying about it. Your best strategy is always to proceed on the basis that life will continue as normal.
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From the BBC:

The UK has been told it must pay an extra £1.7bn (2.1bn euros) towards the European Union's budget because the economy has performed better than expected in recent years.

The payment follows new calculations by the EU that determine how much each member state should contribute.

It would add about a fifth to the UK's annual net contribution of £8.6bn.